A man and a woman in their 30s are in critical condition Wednesday morning following a fire and explosion at a home in south Sacramento.

The man who lived in the home where the explosion occurred is said to have burns on 60 percent of his body. The woman has severe burns on 75 percent of her body.

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The cause of the suspicious fire was not immediately known.

Walls at the home bowed out several feet in the explosion and flames shot 30 to 40 feet in the air, according to the Sacramento Fire Department.

Firefighters were not aware of any victims as they fought the fire. They later learned that two people were dropped off on some benches near the emergency room at UC Davis Medical Center, and the driver sped off.

They who are now intubated in critical condition.

The battalion chief on scene said there is reason to believe there could be a third person inside the home's remains. A search will happen later this morning.

As crews continue to mop up the site, they found marijuana plants, generators, lights and other materials associated with a marijuana-grow operation.

At least half a dozen fully grown plants were found in the backyard, firefighters said.